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Refactor table traversal.

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Sponsored by OpenResty Inc.
This commit is contained in:
Mike Pall
2021-09-19 17:38:49 +02:00
parent 4e0ea654a8
commit c6f5ef649b
12 changed files with 156 additions and 210 deletions
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24
src/vm_arm64.dasc
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@@ -1086,21 +1086,19 @@ static void build_subroutines(BuildCtx *ctx)
|//-- Base library: iterators -------------------------------------------
|
|.ffunc_1 next
| checktp CARG2, CARG1, LJ_TTAB, ->fff_fallback
| checktp CARG1, LJ_TTAB, ->fff_fallback
| str TISNIL, [BASE, NARGS8:RC] // Set missing 2nd arg to nil.
| ldr PC, [BASE, FRAME_PC]
| stp BASE, BASE, L->base // Add frame since C call can throw.
| mov CARG1, L
| add CARG3, BASE, #8
| str PC, SAVE_PC
| bl extern lj_tab_next // (lua_State *L, GCtab *t, TValue *key)
| // Returns 0 at end of traversal.
| add CARG2, BASE, #8
| sub CARG3, BASE, #16
| bl extern lj_tab_next // (GCtab *t, cTValue *key, TValue *o)
| // Returns 1=found, 0=end, -1=error.
| mov RC, #(2+1)*8
| tbnz CRET1w, #31, ->fff_fallback // Invalid key.
| cbnz CRET1, ->fff_res // Found key/value.
| // End of traversal: return nil.
| str TISNIL, [BASE, #-16]
| cbz CRET1, ->fff_res1 // End of traversal: return nil.
| ldp CARG1, CARG2, [BASE, #8] // Copy key and value to results.
| mov RC, #(2+1)*8
| stp CARG1, CARG2, [BASE, #-16]
| b ->fff_res
| b ->fff_res1
|
|.ffunc_1 pairs
| checktp TMP1, CARG1, LJ_TTAB, ->fff_fallback
@@ -3384,7 +3382,7 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
| ccmp CARG4, TISNIL, #0, eq
| ccmp TMP1w, #FF_next_N, #0, eq
| bne >5
| mov TMP0w, #0xfffe7fff
| mov TMP0w, #0xfffe7fff // LJ_KEYINDEX
| lsl TMP0, TMP0, #32
| str TMP0, [RA, #-8] // Initialize control var.
|1: